While those are certainly indicators of interest, is their absence an indicator of lack of interest? In other words, "has side projects" is sufficient to prove "likes programming", but I don't think it's necessary.

There's only 24 hours in a day, and mastering any serious curriculum already takes the majority of those.

Then there's family: some have parents to support, and/or a spouse they can't just ignore all evening to sit in front of a terminal typing git push.

Lastly, plenty of people learn or tinker on their own, but they don't all have the (socioeconomically loaded) reflex of marketing themselves with a github repo.

Of my whole Bachelor's, Master's and PhD cohorts, I haven't known one person to have a github repo outside of employment. Some were building little things on the side but sharing them informally, never in public.

What you're looking for is people with no social life, no responsibilities towards anyone or anything (even just being an immigrant can be a huge time and energy sink), and with the social background to confidently market themselves by putting what's objectively noise online.